1: The Academy by Thinking Horndog Thinking Horndog's stories can be a little uneven at times, but this one (and the Swarm Cycle Universe it resides in) is fantastic. To me, this is the canonical Swarm Cycle story, and he does better than most in dealing with a massive cast of characters while keeping it clear to the reader.
2: Daze in the Valley by Jay Cantrell I just reread this again, for the 3rd or 4th time. It's an interesting (fictional) take on the adult movie industry, that never fails to arouse.
3: For Want of a Memory by Lubrican I could list every one of Lubrican's stories here, but I'll single this one out. He's a legendary author and for good reason. I don't think anybody does as well as he can in terms of pacing and building desire in his characters. I also happen to have a massive literary crush on his character Lulu.
4: Oil of Roses by Jim Reader This story is epic. Fillmore does a masterful job making his characters seem like real, complex, flawed people. The action is hot, the story is complex but entertaining, my only complaint is that it doesn't get updated often enough.
5: Sea King by colt45 Colt45 has a number of great stories, however Sea King (and it's sequels) is at the top of my list. Action and adventure, in an interesting and believable fantasy world. I can't help but wish this was an open universe, I'd love to write a few stories for it.
6: Time of Eden and Elves by Mike Cropo If Oil of Roses is epic. This story is mega-epic. Action adventure/military sci-fi with a lot of hot sex thrown in. I was riveted. And then I discovered this was only Book 1 of 5! I must've lost 2 weeks to non-stop reading of this series, and it was totally worth it.
7: Tired of Being the Nice Guy by MWTB Classic, funny, and hot. This is one of the first BDSM stories I'd ever read. I still come back and read it from time to time for fun.